With softpin we allow the userspace to take control over the GPU virtual address space. The new capability is relected by a bump of the minor DRM version. There are a few restrictions for userspace to take into account: 1. The kernel reserves a bit of the address space to implement zero page faulting and mapping of the kernel internal ring buffer. Userspace can query the kernel for the first usable GPU VM address via ETNAVIV_PARAM_SOFTPIN_START_ADDR. 2. We only allow softpin on GPUs, which implement proper process separation via PPAS. If softpin is not available the softpin start address will be set to ~0. 3. Softpin is all or nothing. A submit using softpin must not use any address fixups via relocs.
Showing the changes to include/uapi (1 of 8 files). Show all
Unified · Split
| @@ -73,6 +73,7 @@ struct drm_etnaviv_timespec { · 72 unmodified lines | ||
| 73 | 73 | #define ETNAVIV_PARAM_GPU_INSTRUCTION_COUNT 0x18 |
| 74 | 74 | #define ETNAVIV_PARAM_GPU_NUM_CONSTANTS 0x19 |
| 75 | 75 | #define ETNAVIV_PARAM_GPU_NUM_VARYINGS 0x1a |
| 76 | +#define ETNAVIV_PARAM_SOFTPIN_START_ADDR 0x1b | |
| 76 | 77 | |
| 77 | 78 | #define ETNA_MAX_PIPES 4 |
| 78 | 79 | |
| @@ -148,6 +149,11 @@ struct drm_etnaviv_gem_submit_reloc { · 69 unmodified lines | ||
| 148 | 149 | * then patching the cmdstream for this entry is skipped. This can |
| 149 | 150 | * avoid kernel needing to map/access the cmdstream bo in the common |
| 150 | 151 | * case. |
| 152 | + * If the submit is a softpin submit (ETNA_SUBMIT_SOFTPIN) the 'presumed' | |
| 153 | + * field is interpreted as the fixed location to map the bo into the gpu | |
| 154 | + * virtual address space. If the kernel is unable to map the buffer at | |
| 155 | + * this location the submit will fail. This means userspace is responsible | |
| 156 | + * for the whole gpu virtual address management. | |
| 151 | 157 | */ |
| 152 | 158 | #define ETNA_SUBMIT_BO_READ 0x0001 |
| 153 | 159 | #define ETNA_SUBMIT_BO_WRITE 0x0002 |
| @@ -177,9 +183,11 @@ struct drm_etnaviv_gem_submit_pmr { · 23 unmodified lines | ||
| 177 | 183 | #define ETNA_SUBMIT_NO_IMPLICIT 0x0001 |
| 178 | 184 | #define ETNA_SUBMIT_FENCE_FD_IN 0x0002 |
| 179 | 185 | #define ETNA_SUBMIT_FENCE_FD_OUT 0x0004 |
| 186 | +#define ETNA_SUBMIT_SOFTPIN 0x0008 | |
| 180 | 187 | #define ETNA_SUBMIT_FLAGS (ETNA_SUBMIT_NO_IMPLICIT | \ |
| 181 | 188 | ETNA_SUBMIT_FENCE_FD_IN | \ |
| 182 | − ETNA_SUBMIT_FENCE_FD_OUT) | |
| 189 | + ETNA_SUBMIT_FENCE_FD_OUT| \ | |
| 190 | + ETNA_SUBMIT_SOFTPIN) | |
| 183 | 191 | #define ETNA_PIPE_3D 0x00 |
| 184 | 192 | #define ETNA_PIPE_2D 0x01 |
| 185 | 193 | #define ETNA_PIPE_VG 0x02 |